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对某高速公路隧道衬砌混凝土进行了快速碳化试验,探讨了应力状态、应力水平及水灰比对混凝土碳化的影响规律,建立了变碳化系数多因素碳化模型,并对碳化影响因素进行了灰关联分析。结果表明:拉、压应力分别加快和减缓了混凝土的碳化速率,且应力水平越高,碳化速率的改变越大;碳化速率随水灰比的增加而加快;碳化系数并不是常数,而是随碳化龄期呈现明显的时变特性;碳化龄期对碳化深度影响最大,应力水平影响次之,而水灰比影响最小。
A rapid carbonation test was conducted on the lining concrete of a highway tunnel. The influence of stress state, stress level and water-cement ratio on concrete carbonation was discussed. A multi-factor carbonation model with variable carbonization coefficient was established and the carbonation influencing factors were gray relational analysis. The results show that the compressive stress of concrete accelerates and slows down the carbonization rate of concrete, respectively. The higher the stress level, the greater the change of carbonation rate. The carbonation rate increases with the increase of water-cement ratio. The carbonation coefficient is not constant, Carbonation age showed obvious time-varying characteristics; carbonation age had the greatest impact on the depth of carbonation, followed by the stress level, while the water-cement ratio had the least effect.